Electric double layer capacitor

Details Electric double layer capacitor Electric double layer capacitor

2007-10-23

2007-10-23

Thomas, Eric (Department: 2831)

Electricity: electrical systems and devices

Electrolytic systems or devices

Double layer electrolytic capacitor

C361S503000, C252S062200

Reexamination Certificate

active

11085474

ABSTRACT:
The invention is intended to reduce expansion proportion of electric double layer capacitors by combining nonporous carbonaceous electrodes produced by a specific method with an electrolyte of a specific structure. Provided is an electric double layer capacitor comprising nonporous carbonaceous electrodes soaked in an organic electrolytic solution, wherein the organic electrolytic solution contains a pyrrolidinium compound salt as a solute, and wherein the carbonaceous electrodes are electrodes obtained by the method comprising a step of obtaining a carbon powder by prebaking a needle coke green powder under an inert atmosphere, baking the prebaked needle coke powder in the presence of alkali hydroxide under an inert atmosphere, and removing the alkali hydroxide; and a step of shaping the carbon powder.

REFERENCES:
patent: 2002/0039275 (2002-04-01), Takeuchi et al.
patent: 2003/0137798 (2003-07-01), Kawasato et al.
patent: 2006/0171101 (2006-08-01), Kawasato et al.
patent: 02-069916 (1990-03-01), None
patent: 11-317333 (1999-11-01), None
patent: 2000-077273 (2000-03-01), None
patent: 2002-025867 (2002-01-01), None
patent: 2003-171105 (2003-06-01), None
patent: 2004-087956 (2004-03-01), None
Michio Okamura “Electric Double Layer Capacitors and Power Storage Systems” 2ndEdition, The Nikkan Kogyo Shimbun, Ltd., 2001, pp. 34 to 37.
Takeuchi Yasushi “Porous Materials: Characterization, Production and Application”, Fujitec Corp., 1999, pp. 56 to 61.

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